Microwave-absorbing properties of shape-optimized carbonyl iron particles with maximum microwave permeability |
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Authors: | Fusheng Wen Wenliang Zuo Nan Wang Fashen Li |
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Affiliation: | a Institute of Applied Magnetism, Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, PR China b State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinghuangdao 066004, PR China |
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Abstract: | ![]() The microwave-absorbing properties for different shapes of carbonyl-iron particles prepared by the high-energy planetary ball milling with 40 vol% in epoxy resin matrix have been investigated. Higher value of magnetic permeability and permittivity can be obtained in the composites for thin flake carbonyl iron than spherical powders. The results are attributed to reduction of eddy current loss, orientation of magnetic moment and space-charge polarization with the shape change from spherical powders to thin flake particles. As the iron flakes with 0.4 μm in thickness as the absorbent fillers, the minimum RL value of −6.20 dB was observed at 4.57 GHz with thickness of 1 mm. The minimum reflection loss (RL) shifts to lower frequency and the value declines with change from spherical powders to thin flakes. It results from the considerable dielectric loss in the absorbing materials. |
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Keywords: | 75.50.Bb 75.40.Gb 84.40.&minus x |
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